Enhance your cycling performance with the Polar CS Cadence Sensor Bike designed for Polar CS400, 300, 200, and 100. This cadence sensor allows you to measure your pedal stroke and maintain the optimal cadence for efficient cycling. The sensor is powered by batteries and easily attaches to your bike. It comes in a sleek black color and is made of durable plastic material. In addition to measuring cadence, this sensor also features sensors that track your cycling progress. It is perfect for anyone who wants to enhance their cycling experience. Whether you are a beginner or a professional cyclist, this cadence sensor is a must-have accessory for your bike. Order now and take your cycling experience to the next level! Please note: Product is new, package has been opened.